THE USE OF A PHOSPHORUS-POLYTHENE MIXTURE FOR FAST NEUTRON MEASUREMENTS
A convenient way of measuring relative fast fluxes in a small reactor core using foils of phosphorus-Polythene mixture is described. Determination of the disintegration rate of these foils involves the measurement of the BETA -ray self-absorption of the foils as a function of thickness. Accurate disintegration rate measurements after irradiation for 6 hr using 7/16 in. dia foils enabled fission fluxes of 5 x 10/sup 5/ n/cm/sup 2/ sec or more to be measured absolutely to within plus or minus 6 per cent and fluxes as low as 5 x 10/sup 4/ n/cm/sup 2/ sec to within plus or minus 20 per cent when the counter background was 80 c/ min. By reducing this background and increasing foil size, both of these limits are lowered by about a factor 50. The method compares favorably with methods using the S/sup 32/(n,p P/sup 32/ threshold reaction. (auth)
- Research Organization:
- Associated Electrical Industries Ltd., Aldermaston, Berks, Eng.
- NSA Number:
- NSA-16-031845
- OSTI ID:
- 4776531
- Journal Information:
- J. Nuclear Energy, Pts. A & B. Reactr Sci. and Technol., Journal Name: J. Nuclear Energy, Pts. A & B. Reactr Sci. and Technol. Vol. Vol: 6
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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